How does the "When someone subscribes to any list" trigger work?

A very common type of automation, the Welcome Emails, are based around the premise of triggering an automation as soon as someone subscribers to a mailing list. Designing your own automation, whether it's a Welcome Email or something equally useful, is very easy. First you need to choose the right type of trigger among the available trigger types - the "When someone subscribes to any list" trigger type will fire your automation when someone subscribers to any of your lists.

The only parameter that you need to define on this type of trigger is whether the automation will be triggered for every subscription made, or whether it will be triggered only on the first subscription per list.

After you're done, clicking on the Save button will get your trigger ready and waiting inside your workflow.